Sprocket



FIG. 1 is a front perspective view, according to the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a cross-sectional view at line 5-5 in FIG. 2.

The broken lines shown on the sprocket are included for the purpose of illustrating portions of the sprocket which form no part of the claimed design. 

CLAIM The ornamental design for a sprocket, as shown and described. 